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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '923f182f1fbacd369688583732de36f4bdc6de047268b8daff99ba41fc8b9c25' 
  AND token = 'ZW4c3Ku6YVs44sNl4LY+WRKbPRLjTkiUX4kZD0Y+gFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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