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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00a17f6be3b7013b702567cc3b323f3e16a51fc53269106a76af34eb8c0ac6e9' 
  AND token = 'QiXyEw5oNpfscfm3M9SDXK4+300WA/qlAr0jnDFeJOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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