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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '512137ceafa191145819660f3387067e2ade82de7d469b1cf9a99541e2ae2afe' 
  AND token = '1uJC+5mzOq50r/aQRdGVBqONMAnLasIzq4Ho9th+zq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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