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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b70cba954dc0d35ac5e6436ce5797b7f859ad6cfefb83d78925be71eedaffcd' 
  AND token = 'fvK46UITVja4s9SceOU1agHSfMogbyIheGtGWQPHGqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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