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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ceb132858f34dcb09828569589a860e5effefbc2786e188f66b1caba2840918' 
  AND token = 'Eo27hHy3ZUTBItqmL4V5TWZJ147w4R3sQLpnkZmtFW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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