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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26541109c9f053c59fbcc78c0cfcf316746283b0b9bcae03a85931aa5da925b5' 
  AND token = 'l8bVOrn2nVBAuvyydImRxvYKZlRBCBxoCy6t++LNocM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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