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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48e0235d6ea9a794832a338a48468c67587eed66df0e8c37627b4f088e5a34f2' 
  AND token = '1N+hgJawk97kYRHF84ebIEiir96J/AaGkslj+Qm1w3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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