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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e71cfdd24c2da8077fe7e62255c2821ee21736b3e14afdb8ca255928c6040de3' 
  AND token = 'cOMUwFDz6e8EqSmu7lsmPmYoAlO8T/8QhlXIGQMMFtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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