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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b76f55eea2ecad8755b55aae5a545b5d57350c3554019ebe4745da25b87f2893' 
  AND token = '8r5kLA7kAQjS0B3kSHJMyNfA8MJV9gVokMB7g5yaQN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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