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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a1337c24aa869d0745315dd6d52a002f2863305ea38f2528ca35b7626543a4c' 
  AND token = '0gKjYxikzruZynKgkH4wBsTiorKaimuOMYDA8ow6zn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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