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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28b2845ecda9ea3ea918fdbcc85e66a7ef66e8047a74eae0ec1a996276de7e6a' 
  AND token = 'PO3zGjZU0Lj2/IP7d/OEVDq35bEV/Ms41jjoMSMSY90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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