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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ce9e9d4f24860042d959beca66cddf08dd1e08114f1bf75af8cbf793110afec' 
  AND token = 'O0OWLevYMC+AAxuz9QQ3fN84ZLqluZn3ZkEfG0GNdLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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