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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee1905d7f4c0f2bb78ecce0a19b557c80d89c7b6fdcb5686cafb1cc178044770' 
  AND token = '/WJ4ZVEn0pl+jjQRU4onkTUjEZt5a77Vrsi/SpEZPBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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