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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7a1bafb75f02022b25a6abb0d0837f038b8a1d8b5e6cc2b3aa9dafa9af3f08a' 
  AND token = 'Ge23gS3t9bCGeNDr3bz712kLypIykyOX2/9HUxPjWdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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