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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd284528ef4268fbbc1dcb41be05738d9b8f1a8fafe0d5c40c6bcdaf59806e736' 
  AND token = '1+t9CSHrh1OT11CU/CXJXPZhlGO5hX8WOal0lmUq2cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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