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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8a338b19db1a7e9e51018b6a5a373394b373eb04d2105248ae306daf9f0efc0' 
  AND token = '7QIbTN8v2n+5r1rJX5nz3lI+6WNx50gv1pPchl5bEsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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