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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68a5d84526a08c843ad7ceca734321eb2e8548d859406bda330538f5aaae0e3a' 
  AND token = 'S8Z8gb7BOmo01pdBTLYOYP2dGWHjvC62yJCU1eyBq54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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