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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5745a4a81e7b627051e0ae3c29e21d049303536a55aa19cfced5b1c341fe3175' 
  AND token = 'Z9y1ImOIFkqI6lbJZET41Jl5orWnf6Cgb/rECEYAM9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}