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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10741422e1520c905ac7b1bef16df842558af780ad221f6d10d5a0849b5f9804' 
  AND token = 'Jo66r2wTG/sJsh2+z0BRjOGQgERUoKin4Xt0WqoE18U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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