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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86a68aabff784b74a933b23d3145ef673bf931e72b65ae86023e4b0efc051c7e' 
  AND token = 'qS/3iQz9r8Z+YyzXmx4fmD1hNAFCR77GNEaawtBpKyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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