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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '898ffb1334828fbc31581824bfe72d1f683d68ed2df0e3826915880d8960409a' 
  AND token = 'diHIR6nLkukJ8kBJtZfBk4d8450jXWrONAtLTOeqM7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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