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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c34f22152e087cc628e097189e101c8b8691d13bfa0987dc61b59ff102eeba0' 
  AND token = 'tMLRnUE8YjzSH2LR7iEv+12EvSL+ykECFvvKAY4eg4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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