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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '802758fc708e3b5e5b5218b21ba46984a3a61c03c28db25f81532eb304da94ec' 
  AND token = 'n8vxrwx3xnEsaOZV8Y0AMAv8wcGGJJ0bnpkBgHhhjng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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