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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0e2c61e4aa8a0db8c45b962f0b314a88bf32be0a68dfc98869e6b573ded779e' 
  AND token = 'HM2ciTti5bQBOv0ZaSkkXPib/2TWt5bXaSHXappRwGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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