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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edf0ecf6a5e06a7c9bb25b8168c417c6e603a9559a8550b39ec00a788d469f7c' 
  AND token = 'aT200cXpGeiKEaNzDWItyL8UJw2XLpNq5ghQsEGDyHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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