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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c1f85aa2e96e156316434ccd930b3d8858cedfdd32a3909cfe8818a4300ef8' 
  AND token = 'ig+QF22vRavmJyYaokSs49dSMMSDqzJ4Z0w662z0WaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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