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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd02669d08a26ca5a73bb64c5c8d47483c22e5a6a8d85f331a3255b614a36158d' 
  AND token = 'SPMrWt6s4T4Hdo9HmBUq/o4Zc6XBauvPqtom5LKHew0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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