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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e7cbcf4b23a23b8769c1dd77d67a053b8f7dc4ff92a76002fdea431a95d2dcd' 
  AND token = '79Y42YCIPYkpeeY75BOiNml/GtniKM7RCPy+mjYawTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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