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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20bc60942f51f294d5cd6512dd10cb2feb66e00044c97ca3a0c82292d24c83ad' 
  AND token = '02IFEh/AiXkcKJZe3771gt2GPmTEUfd/AmpQC560A7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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