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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1ec0352575a74b4b77df1433db84150145983d019b1c1503fd193d6e7114a34' 
  AND token = 'RTFE2u2dvO6JfcndJWRHgubwfQ6tE6KsZj6zPx2LN2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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