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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58cf7e7b2ce0d0e05c34a5918ef9754dd51ea49a6334fc7507dd7b49721dd2d1' 
  AND token = 'c644s1emLs8Fi3QqcSh2ViS2Cvc6Uium8NM3uDMh/AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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