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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90a5b2d213879ecf47cebadaaf60c1c81b2f0126ffb14a232004119e2567fb16' 
  AND token = 'Vt3Nas1ILX7oE7N5Nlam4Cd0cCtPP6fkM+fPqkhTQtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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