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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '577186772ac1e3c01bb5767b2a24d1db9cb02350ff394fadac4a7c62b646c673' 
  AND token = 'v04z/nDQ32GAprSQnBD2Ig77n+VdQX5rfT8YfMReL7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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