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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0d4c11084aa8576b02706014894b5ca70b511e376791d349c70ece8d70aeafb' 
  AND token = 'bvJV/dxFGMtBmeX3MekNYkCoAkdAsMD5qlLN65e6zJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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