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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe03d9c8b4b73facb574c5a5b59c3337a536dc3582495ab3c1875ff7a0ebf600' 
  AND token = 'zHAm7PjdZJMO02F+r8E2siHnJfo7kXUkIpA9qLSR/NQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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