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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54254359f8cb4e58ad880c68e349442624922c37ca39e178f881de13a86ce91d' 
  AND token = 'weOW9ZbWq38nK2hpQ867xsNghXgfJVoEM7ZgTS0Oo0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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