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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30818e3ee93c403f3e64c5e40358c0b43d62c50ddfdb01f33f1546427a48058e' 
  AND token = '0bFuqfwE2871ll+x6xZJRBsLPBNGy6bLDS1pDOGCIxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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