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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4960d9ad504989254d62635d7c7abd7ed7f2a761eacee55cd7a1f0c78f02ab63' 
  AND token = '9ok21E7J4p+Dd6oGCsFbXdMaiG2YCpcWaI0W4b34GcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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