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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '199c5805eece5130f87e82541eafba8c23cf8239d53453f2a5fb4cf698082c2a' 
  AND token = 'n0+ZMcj/GJ07N1y/eMXyMOUWNolWZ1kXOmZYMekAiNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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