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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56c8838c0f2195aef32c2f65243313b7a6c9f5bc82be2ec22f2faf8708889ce3' 
  AND token = 'p7YIoW+I8V6twV8OCyFGecCPyzTQcVrRcbm6+9E9zuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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