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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75300fc95232dc3272cca8d193e88c01f0290ca50c211391580089ff6b29925e' 
  AND token = 'J6jAlqRE+GpVEoOFFnRb6s7xvOjVYSFFmsQqrtdwg2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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