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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d94936adf5f94606e4cad7a1480c87756a7c9d151cdab764b8c5d28fc7aff3d' 
  AND token = '36DosHNZuj2pFe+eZnGQsxRarFjFDr3viLiFCeGFsbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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