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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9b3ca6d8a8b46cd3cb16a57dcb32b32ef80f46cafedf42f4a091d7793dc9794' 
  AND token = 'pXdmMRi5o1uxrsyX916gYVAWrQJQ0chsXwlcCgRYu24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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