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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b256e2a9c3f508d3082c47df33dd4c74e9524c77a1794e4958a4dafd7c1c8dd3' 
  AND token = 'cJk66CMhjTbdP8LyLBkxYnLKfaPKYSRk3eXqqjgUsII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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