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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f4ab146ae03c7573b4cd9ade7207f929d7695340556d01ca4508ede0b2efe25' 
  AND token = 'BlY2bLypHo/TBmhRPqdCwX4Pr+cVME5rLf6GGNCCY1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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