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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a4ccbbbdfd39d798c62ffd9d15041e208e45af508e11db81e1ff4d81b235f44' 
  AND token = 'SZwDgl6Jpv1Or1kJGswSILQOFCCi2aSO33+0+CU+iYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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