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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '030936ba035c18bd17c0a295f99dcafeec9e7e7575834201c155f5a79e4be91b' 
  AND token = '3JnkUsBt74a2IAhy+0v/JAcarG4jXeW7IJKRWr0w3Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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