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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '973d6db604764cb5c996f8f11990f531278fbad36aaca9e4b12fe4b7a4fdecd2' 
  AND token = 'A65HwBbM9rMvWVmbFLWdRD2064Q/Q97Ud82/t2nMPsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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