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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c4029230a38b62cbc39db23f8c041e6f0d79b0858789e2eab518e11b462c615' 
  AND token = 'KqC2EZY5PXeFQIz4Mg425IjWCYHaCdj0pz5oep2rTgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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