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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eeefbe612bc337a8a6c9283dd7fc2afbc0b9d1d74508247e49e8b8d5c7ffa39' 
  AND token = 'SSrQxMsHVPGlx7Jbckyuwv2zEaJ91XSPdAmxPekYkS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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